MECHANISM OF LABOUR

First stage of labour – first stage of labour starts from regular onset of labour pain or contraction to  the full dilatation of the cervix.

Second stage of labour -It is starts from the fully dilatation of  cervix to end of the delivery or baby out .

3rd stage of labour – it is started from end of the delivery or baby out till delivery of placenta .

4th stage of labour -It is starts from after delivery of placenta till one hour for close observation of the mother to watch bleeding.

In second stage of labour, mechanism of labour takes place means baby will come out from the uterus through pelvic by series of movement,that series of movement  occur in fetal head and trunk  in the process of adaptation this is called mechanism of labour in LOA or ROA 

 

Lie – Longitudinal 

Presentation – Cephalic 

Position -LOA OR ROA ( left occipitoanterior or Right occipitoanterior position.

Attitude – Flexion 

Denominator – Occiput 

Presenting part – Vertex 

Steps or events in mechanism of labour-

1-Engagement of head

2-Flexion of the head

3-Internal rotation of head

4-Crowning

5-Extension of head

6-Restitution

1. 7- Internal rotation of shoulders and external rotation of head

8-Birth of shoulders and trunk. by lateral flexion